Wednesday, 2015-05-13

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bellHi10:42
bellis anybody there ?10:42
_nickbell: just ask your question, if / when someone's around who can answer then they probably will11:03
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mnaseranyone from ubuntu know if the packages are on their way soon for this? https://lists.gnu.org/archive/html/qemu-devel/2015-05/msg02561.html15:06
mnaserhttps://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa/+build/742469215:08
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jlkfloppy drivers.... in 2015.16:59
jlkamiright??16:59
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mnaserhttp://www.ubuntu.com/usn/usn-2608-1/17:50
mnaserhurry up folks17:51
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rlrevellmnaser: are there any reports of it being exploited?17:59
mnaserrlrevell: i dont believe there is a poc that's out, which makes it quite inaccessible out of the hands of script kiddies17:59
mnaserbut the patch to fix it is out, so i wouldn't give it a long time17:59
rlrevellmnaser: looks like you also have to have malicious clients18:00
rlrevellcustomers i mean18:00
mnaserrlrevell: not necessarily, you don't always control the environment.18:00
mnaseroperating a public cloud could also have people purposely sign up for the only reason of exploiting the environment too18:00
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jlkyeah, pub clouds are the most at risk18:04
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jlkrandom users, lots of juicy targets next door18:04
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mnaseryep ^18:09
mnaserbut you can avoid the reboot18:09
mnaserby doing a suspend/resume18:09
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jlkyeah, that's likely what we'll have our customers do18:13
jlkour customers are mostly single-tenant though, no shared clouds.18:13
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rlrevellmnaser: any idea to what extent the "attackers would be isolated by the libvirt AppArmor profile" thing mitigates the problem?18:43
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mnaserrlrevell: basically, it implies that the exploit gets you out to a land that is controlled by apparmor18:50
mnaserso you're at the mercy of apparmor to keep you save then18:51
rlrevellmnaser: and it looks like apparmor allows libvirt access to quite a bit18:51
mnaseryep.. i wouldnt count ion it18:51
mnaserafter you upgrade kvm18:51
mnaserall you need to do is18:51
mnasernova suspend <vm>18:51
mnasernova resume <vm>18:51
rlrevellmnaser: i'm still at the lab stage so i can just reboot everything18:52
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mnasergood enoguh18:55
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xavpaice_suspend/resume takes quite a while though doesn't it?  Minutes for us, at least20:32
xavpaice_live migration seems better, but I need to understand it better before feeling confident20:32
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mnaserxavpaice_: we use SSDs so it's quite fast20:51
xavpaice_:)20:51
mnaseryou have to factor in that the entire state of memory is written to disk, so the more memory on the server, the more data it has to write20:51
mnaserlive migration can work out well, the only caveat is if you're using configdrive, live migration fails (even with block storage migration :\)20:52
xavpaice_yeah, that's why it's so slow for those of us with slow disk on the hypervisors20:52
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xavpaice_I've had a few instances get kinda stuck during live migration, still trying to collect enough detail to figure out what's going on20:53
mnaserdo these instances have a lot of memory?20:53
mnaserlive migration actually copies the contents of memory then rescans it again for changes and sends those changes, and it keeps doing that until they're sync'd enough for it to pause the old instance, sync, and unpause20:54
mnaserif you have a lot of memory on the machine and your link speed is slow, the memory changes will be way faster than the speed of transfer, and you're stuck in this loop of constantly moving memory contents20:54
mnaseri hope that made sense20:54
xavpaice_it does, and that's pretty much what I reckon is happening20:55
mnaseryeah there's not much you can do other than lowering the load/memory usage on that instance or upping the speed of the links20:55
xavpaice_the network the live migration is running over is only 1Gbps, considering adding that vlan to the 10Gbps links we use for storage access20:56
xavpaice_it appears also to be the instances we know are particularly busy20:56
mnaseryeah, that can explain the memory contents changing a lot at a qucik rate20:57
mnaserif it was fairly idle, memory would sit at the same20:57
xavpaice_I've not yet attempted pause/migrate/resume - if that's even possible20:57
mnaserhm, not sure about that combination20:58
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jlkit is21:05
jlkthe non-live migrate does pretty much that21:06
jlkit's like resize21:06
xavpaice_resize actually reboots the instance though21:07
xavpaice_(as it needs to for most guest OS's)21:08
jlkoh true. yes.21:08
xavpaice_nova migrate actually shows up in the logs like a resize21:08
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mnasermigrate uses the same codebase as resize actually21:09
jlkhttps://blueprints.launchpad.net/nova/+spec/migrate-non-active-instances21:10
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jlkmnaser: migrate yes, live-migrate not as much21:10
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mnaseryep21:10
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xavpaice_unfortunately can't pause then migrate or live-migrate21:13
xavpaice_so if there's an instance that's too busy to live-migrate, it's going to need a reboot21:13
jlkthankfully we don't support live migrate at all21:13
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xavpaice_do your customers not mind their VM's getting rebooted?21:14
jlkthey might, but migration is "non-cloud" or so we tell them21:15
jlkmore realistically we just don't have it wired all the way up yet, it's a future feature21:15
xavpaice_wise choice IMO21:15
xavpaice_so far, it's not been the most reliable thing for us21:16
jlkyup.21:16
jlkand as a maint tool, there is no guarantee that there will be enough space elsewhere to do the shuffle21:16
harlowjaalso fyi for u guys there is a #kvm channel in freenode that is also talking about this (currently/recently)21:16
xavpaice_we try hard to assist customers to use apps/instances in a way that can easily withstand reboots one at a time21:16
xavpaice_thanks!21:17
mnaserthanks harlowja21:17
harlowjanp21:17
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* harlowja doesn't think it has a logger attached anywhere, but not sure21:17
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harlowjanope doesn't appear so, so if u intersted, thats where some of the qemu/kvm people are i think21:23
harlowja*in that channel21:23
jsnowmy ears are ringin'21:24
harlowja:)21:24
xavpaice_https://github.com/xavpaice/openstack-tools/blob/master/livemigrate_instances.py might come in handy btw, feedback/pr's most welcome21:25
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